Shaft holder



Sept. 25, 1951 E. c. DAILEY SHAFT HOLDER Filed March 30, 1949 9 E Z/ 7' a 24 5 Z3 r 20 6 llafiailey INVENTOR ATTORNEYS.

Patented Sept. 25, 1951 UNITED STATES PATENT OFFICE snAF'r noLnnn Edward 0. Bailey, West Newton, Pa. Application March' 30, 19 19, Serial No. 84,353

2 Claims. (01. 90-59) 1 This invention relates to an attachment for metal working lathe, in the nature of a'shaft holder having particular utility in the cutting of keyways in shafts.

An important object of the present invention.

is to provide a shaft holder of the character described that can be attached readily to a metal working lathe of conventional construction, and I can be detached with equal speed and-facility.

Another important object is to provide an attachment of the character stated novelly designed in a manner to permit a shaft supported thereby to be speedily and easily positioned, 5

with complete accuracy, for the cutting of a keyway therein. 7

Another important object is to provide an attachment of the type stated which willhave versatility in regard to the diameter of shafts capable of being supported thereby, the attachment being capable of handling varioussha fts of different diameters, and being readily adjustable to accommodate said shafts.

Another important object is to provide a device of the character described that can be constructed at a minimumof expense, but which will nevertheless be quite durable and will have few parts simply arranged in a manner whereby they will not readily get out of order.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings,

Fig. 1 is a longitudinal section through a shaft holder constructed in accordance with the invention.

Fig. 2 is a top plan view.

Fig. 3 is an end elevation taken from theright of Fig. 1.

Fig. 4 is an elevation of a removable spacing insert.

Referring to the drawings in detail, 5 designates the conventional cross carriage slide post of a metal working lathe, the invention being mounted removably upon said slide post.

A flat elongated base 6 is integrally formed with 9. depending collar 1 recessed to receive the slide post 5, and spaced circumferentially of the collar 1 are the threaded radially disposed bores 8 receiving clamping screws 9. Inserted between V 2 the clamping screws 9 and the slide post 5 are the gibs 9'. Thus, the base 6- is securely and removably connected to the-cross carriage slide post.

It will be understood that the graduations on the cross slide are utilized for the desired angle informing the keyways in'shafts. For example,

"a setting of zero degrees provides'for a straight keyway, while for tapered keyways any desired angle is used as a "setting.

Upstanding fromthe base 6 is the end wall" integrally formed with the base, this being formed near its upper end with the opening l'l' in which is press. fitted the bushing I 2 having at one end the collar 13, said bushing [2 being formed with the threaded bore I4 receiving the elongated pointed screw ii that constitutes a shaftcenterer. On the head of the screw I5 is fitted the turning knob l6, and lock nut 11 threaded on the centerer is adapted to be threaded against one end of the bushing l2 for the purpose of locking the centerer in selected adjusted positions to which it is threaded in the bushing.

Formed in the other end of the base 6 is the smooth walled bore or opening l8 in which is mounted for vertical adjustment the Y-post I! having the depending threaded leg 20 extending through and vertically slidable in the opening 18. Lock nuts 2| are threaded on the leg 20 and are adapted to be tightened against opposite faces of the base 6 for the purpose of tightening the Y-post securely to the base in selected positions of vertical adjustment.

At the base of the forked portion of the Y- post I9 is formed a small recess 22 receiving stud 23 formed on a forked insert 24. Thus, the insert 24 is adapted to be removably positioned between the arms of the Y-post, for a purpose to be apparent.

In the upper end of the Y-post I9 is formed a threaded opening 25 receiving the clamping screw 26 that is adapted to be threaded downwardly against the uppermost surface of work W comprising a shaft in which a keyway is to be formed.

In use, the shaft holder is mounted upon the cross carriage slide post 5 in the manner described hereinbefore. An angle setting is made as desired. The work W is then extended through the Y-post I9 and the pointed end of the shaft centerer I5 is centered on the end of the work. The clamping screw 26 is then threaded against the work to keep it from slipping off the point of the shaft centerer during the making of further adjustments. A conventional level, not shown, is

the shaft W will be on dead center with the head stock. The carriage is now moved up to give the desired depthzoflkeyway, and the operation of forming the keyway can proceed.

It has been found in practice that a device I,

constructed as illustrated and described will alresult of which errors in cutting keyways with full accuracy are reduced to a minimum-L It will be understood that the insert 34'.

wherever the shaft is of a smaller diameter. The

insert is simply droppedinto the recess"; as aresult of which the amount of adjustments possible to' accommodateshafts of .diiferentdiametel-s is' considerablyincreased.

What is claimed is:

1. A unitary shaft holding assembly for metal working lathes comprising an elongated flat having a threaded opening, an elongated shaft centering screw threaded horizontally through said opening and adapted to bethreaded against one endof'a piece of work mounted abovethe base, a Y postmounted for vertical adjustment in the-other end ofthe base, means for locking the Y-post in selected positions ofvertical adjustment, a removable insert adapted to be mounted upon the Y-post for accommodating the Y-post to pieces of work differing in diameter, and a clamping screw threaded through the top of the Y-post and adapted to clamp to the Y-post the other end portion of said piece of work.

2. In a shaft holder for metal working lathes a base including an upstanding end wall at one end tering screw threaded in said end wall and exways provide a dead center for the workggaszp: a

tending toward the other end of the base, a Y-post including a depending stem extending 'throug'hthe-base at said other end of the base,

a means for;cla1nping said stem to the base in REFERENCES CITED The following references are of record'in the 'file of this patent:

UNITED STATES PATENTS Number Name Date 742,576 Bronaugh Oct. 27, 1903 989,005 Hanson Apr. 11, 1911 1,457,837 Hayford June 5, 1923 2,273,369 Nielson- Feb. 17, 1942 2,356,591 Jesionowski Aug. 22, 1944 

